Scooper ‘Blight’ tells us that a “First Look” at the Watchmen movie is running before films at Regal theaters. We assume it’s a segment created by National CineMedia:

Not sure if you guys were aware of this or not but there’s a new featurette running on Watchmen in Regal Cinemas now as part of “Regal’s First Look” with some footage I hadn’t previously seen of Manhattan at the funeral, The Comedian, etc. It was not in either trailer. Just a heads up.

These segments usually don’t make it online, and when they have, they’ve been removed, so your best bet to see it is probably to check it out in theaters.